Bilateral knee pain. 22yo. Perhaps I'm a hypochondriac but I started feeling it in my other joins a few weeks ago.(all other joints) Has persisted in knees for 5 months since I left on an 8 hour flight. I slept most of the way and was sitting in a constrained position(coach). Woke up with bilateral knee pain could not walk. Participated in races the month before 5ks, halves 1 full marathon. Understand that I felt great after the races all of them. It was the plane. Help me please. Thought